Drill.



A. SCOTT & J. G. GRATTAN.

DRILL.

APPLICATION FILED APR. so, 1914.

Patentd Jan. 12, 1915.

1&9... ...31411:

WIT/VESSES entran lerares ritratta ernten.

ALBERT SCOTT AND JOSEPI-I'GEORGE GRATT-AN, OF VANCOUVER, BRITISH COLUMBIA, CANADA.

DRLL.

ifi 24,337.

' specification of Letters Paten-i.

Application filed April 30, 1914. Serial No. 835,482.

To all who/u t may concern le it known that we, ALBERT SCOTT, a subject of the King of Great Britain, and .losicrir (i. GRATTAN, a citizen of the United States, both residing at the city of Vancouver, in the Province of British Columbia, Cana da, have invented certain new and usei'ul Improvements in Drills, of which the following is a specification.

Our invention relates to improvements in drills, and the object of our invention is to devise a simple sure means, whereby a bit which has been stuck or lost in drilling may be rescued after the rods have been partially backed off and the cutting out of the rod or core barrel has become necessary and the cuttings recovered as fast as made, so that drilling may proceed without interruption or delay and without special ishing for cuttings previously made, which according to the present method are left in the hole and lished for by a separate operation, in fact, to dispense with fishing for cuttings and also whereby great economy in the use of.

' lai-ged internally threaded portion' at its upper end, an inner tubular member threaded into the upper internally threaded portion of the pilot at its lower end and fitting treel y into the enlarged portion of the tubular upperl coupling at its upper end so as to be slidable vertically therein and connecting the opening of the nipple with the opening of the pilot and a lock' nut threaded on to the inner tubular member against 'the upper end of the pilot as hereinafter more particularly explained by the following specification.

Figure l, is a sectional view of a boring showing our device in side elevation and intermediately cut away and in position for cutting the rods or core barrel. Fig. 2, is an enlarged sectional View through' the boring and our apparatus intermediately broken awayl of its length. Fig. 8, is an enlarged perspective detail of a point drill as applied to our device.

In the drawings like letters of reference indicate coresponding parts in each ligure.

i is a boring, which has been previously eu B is the upper end of the core barrel or rod lengths. It will be understood that such rods are formed in lengths.' To the lower end of suchvconnected lengths is se` cured a drill. When the drill has become stuck in the boring it is rst necessary to remove by unscrewing al1 the rods possible. Our apparatus is then inserted in the bore so as to cut away lthe remaining rods and core barrel.

We will now describe the construction of this apparatus. f

C is an outer tubular casing having peripheral holes Cin proximity to its upper end. The upper end of theA tubular casing C is provided with an internal thread C2 and the lower end is provided with an external thread C3.

D is nipple provided with a lower threaded end D designed to loe threaded into the internal thread C2 and the upper external. thread D3 for connecting our device to the line of drill rods attached to the drilling machine.

E is a core-shell provided with an internal thread Fl threaded on to the external thread C3 of the Vcasing C.

F is a ratchet cutter provided with a threaded end F.

.E3 is an internal thread formed in the lower end of the core-shell E and into which the threaded upper end F of the cutter is inserted.

G is a tubular pilot provided with an enlarged upper end G fitting vbetween the lower end of the outer tubular casing C and the upper end of `the cutter F. The internal diameter of the tubular pilot G is also provided with an internally threaded enlargement G2 at its upper end.

H ,is an inner tubular member threaded at its lower end into the internally threaded enlargement G2 of the tubular pilot G. rllhe upper end of the tubular member ll fits into the tubular coupling D.

l is a loci: nut which is threaded on to the threaded lower portion of the tubular niember H against the pilot G, so as to hold the Fat-sented Jan. l2,.3l915.

lower end of the tubular member H rmly in position in the recess G2 of the tubular pilot G. It will be understood that the orifice extending through the nipple D, tubular member H and pilot G are in axial alinement, so as to allow vthe water to pass down through' our apparatus into the rod or core barrel B.

Having described the principal parts 1ni -the wall of the bore. If those cuttings were allowed to collect in this position, the --ratchet ,cutter would gradually become choked and the cuttings would. become wedged in the bore and thereby prevent removing not only the drill point but the ratchet cutting apparatus itself. Heretofore the drill is first removed to remove the cuttings which is accomplished by forcing water down the bore .to the outside of the core barrel provided with a suitable trap valve at its lower-end and through which the cuttings are carried by the water ascending within the core barrel. This has been found impracticable for two reasons,

' first, it is found impossible toA raise cuttings by water pressure higher than fifteen or twenty feet, nor when the cuttings lare formed at a great depth is it possible to raise them high enough to allow of their removal, and secondly, in forcing water through the bore to the outside of the rods, the water as it passes down the bore leaks ,away throughthe intersticesof the rock and -by the time the water reaches the cuttings there is not suflicient power left to raise the cuttings.

Infour device we carry the water downwardly through the center of the cutting apparatus to the core barrel and then force it upwardly between the pilot and the internal wall of the rod or core barrel which is being cut away and between the teethv of the ratchet cutter into` the bore, thereby forcing the cuttings upwardly from the cutter through the space between the outer lcasing and the internall wall of the bore until they reach the level of thel holes C through which they float in the dead water contained between the internal wall of the outer casing C and the outer wall of the inner tubular member H. The cuttings sink into this water and are gradually collected. As the distance between the ratchet cutter: F and the holes C is comparatively short, it

is easy for water to force the cuttings to the level of these holes.

` From time to time our apparatus may be withdrawn and the cuttings removed from the apparatus whenit may be again inserted in the bore and cutting resumed- It will, of course, be understood that the rods and core barrel are formed in lengths cont into the internal enlargement D3 of the coupling D. The lock nut may be then screwed into position, so as to lock the inner tubular member in position. It will be seen from this description that there will be no danger of the cuttings choking the ratchet cutter, so as to` prevent its withdrawal, 'and that such cuttings are removed from the cutter continuously as they are made, thereby leaving it perfectly free for operating on the end of the core barrel and preventing any liability of choking, also by our device there is no danger of the water leaking through the holes of the rocks, so

as t6 reduce the pressure for raising the cuttings to the required height, thereby producing an economy in the consumption of water.

What we claim as our invention is:

1. A device for cutting drill rods out of a drill bore comprising a suitably-driven rotating member having openings extending through the wall thereof in proximity. to its upper end, and a -cutting device connected toits lower end, a pilot tube extending centrally through the cutting device and depending beneath the same, a tubularduct extending centrally through the rotatable member into the tubular pilot whereby a chamber is formed between the outer wall of the duct and the inner walll of the ro- Aatng member, as and for the purpose speci- 2. A'device for cutting drill rods out of a drill bore comprising an outer tubularcasing having openingsin the periphery thereof, a tubular duct leading vertically through the outer member so as to leave a chamber between the outer member and the duct, means for adjustably securing the duct within the tubular member at its lower end, a cutting'device connected to the lower end of the tubular casing, a tubular pilot connected to the outer member and extending ythrough the cutting device and having an internal enlargement at its upper end into which the lower end of the tubular duct fits, as and for the purpose specified.

llO

3. A device for cutting drill rods out of a drill bore comprising an outer tubular member having openings in the periphery thereof, a connecting nipple threaded into the upper end of the tubular member and having an internal enlargement at its lower end,

through the tubular member and inserted into the internal enlargement of the nipple at its upper end, a cutting device secured to the. lower ve`nd of the outer tubular casing having an orifice extendingthrough the center thereof, a tubular pilot having an enlargement at its a tubular duct extending4 

